High current switched capacitor converters
23 April 2003
Power Electronics / Power Management
The ADM660/ADM8660 are high current CMOS switched capacitor voltage converters from Analog Devices. They invert the input voltage, producing VOUT = -VIN. The inverting scheme is ideal for generating a negative rail in a single-supply system. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable. A frequency control (FC) input pin is used to select either 25 or 120 kHz charge pump operation, optimising the capacitor sizes.
For applications that demand a higher voltage, the ADM660 can be used to double the input voltage, where VOUT = 2 X VIN. Output voltages of 14 V maximum are attainable. In shutdown mode, the ADM660/ADM8660 consume 300 nA of current.
The ADM660/ADM8660 are available in 8-lead DIP and narrow body SOIC packages. The ADM660 is also available in a 16-lead TSSOP package. Applications are in handheld instruments; portable computers; remote data acquisition; op-amp power supplies.
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